Dictionary of Ichthyology
This dictionary of ichthyology contains specialist terms used in the teaching of undergraduate students. The terms are arranged alphabetically for ease of reference.
In addition to ichthyology, terms from hydrobiology, zoology, anatomy, fish farming and other related disciplines are included.
Where terms have different interpretations, we have assigned the most common interpretation in our view.
This dictionary is constantly being added to and modified.
If you do not agree with the above interpretation of the Terms, please explain your understanding in the comments to these Terms.
We invite you to participate in the development of a modern ichthyological vocabulary.
We will consider any criticism and take it into account when describing dictionary terms.
Scombridae
Scombridae is a family of fishes of the order Scombriformes. The body is torpedo-shaped. There are a..
Scorpaenidae
Scorpaenidae is a family of fishes of the order Scorpaeniformes. Marine, benthic, deep-water and coa..
Secchi disk
Device for determining water transparency. Diameter of the disc - 200-300 mm, painted with white pai..
Secondary products
The biomass of organic matter produced by experiments per unit area per unit time. Secondary product..
Secondary successions
The process of restoration and formation of new communities in habitats where they existed previousl..
Selectivity index
Selectivity index - shows selectivity of individual food items of components by fish. Selectivity in..
Selectivity of fish nutrition
Selectivity of fish nutrition - the ability of fish to consume food organisms in a different ratio t..
Selectivity of fishing gear
Selectivity (selectivity) is the ability of fishing gear to take (select) from the available stock a..
Self-regulation
Self-regulation is the ability of a population to change automatically in response to changes in liv..
Semi-passable fish
Semi-passable fishes - ecological group of fishes that spend most of their life (feeding) in brackis..
Serranidae
Serranidae is a family of fishes of the order Perciformes. Anal fin with three barbed rays. Dorsal f..
Serrasalmidae
Serrasalmidae is a family of fishes of the suborder Characoidei. The body is compressed from the sid..
Seston
From the Greek sestos - sifted.Seston - The aggregate of small planktonic organisms, non-living orga..
Sexual dimorphism
From Ancient Greek δι- - two, μορφή - form.Sexual dimorphism - sexual differences that distinguish m..
Sexual opening
Sexual opening - genital opening, which in salmon, herring, pike and other fishes serves for excreti..